End connection for conductors on field-magnets of alternate-current generators.



N0. 865,219. PATENTED SEPT. 3, 1907. M. WALKER. END CONNECTION FORCONDUGTO'RS 0N FIELD MAGNBTS'OF ALT ERNATE CURRENT GENERATORS.APPLIOATIOI FILED JULY13..1907.

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ATTOIRNEY R 0 T N E v W 1m: mmms PKTERS co, wunmarun, n. c.

UNITED STATES PATENT OFFICE.

MILES WALKER, OF HALE, ALTRINCHAM, ENGLAND, ASSIGNOR TO WESTINGHOUSEELECTRIC & MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

Specification of Letters Patent.

Patented Sept. 3, 1907.

Application filed July 13,1907. Serial No. 383,658.

To all whom it may concern:

Be it known that I, h/IILES \VALKER, a subject of the King of GreatBritain, and aresident of Hale, Altrincham, in the county of Cheshire,England, have invented a new and useful Improvement in End Connectionsfor Conductors on Field-\lagnets of Alternate Current Generators, ofwhich the following is a specification.

This invention is an improvement upon the type of end connectors setforth in my application Serial No. 263,7 72, filed June 5, 1905, andemployed on the rotating part of a dynamo-electric machine intended foroperation at very high speeds. The end connectors for the winding shownin the said application consisted of copper rings mounted concentricwith the shaft and connected to the ends of the conductors that projectfrom the slots in the magnetizable core, the arrangement being such thatthe center of gravity of the structure lay in the center of the shaft.

The object in view was to produce an end connector which would bedynamically balanced in itself, and which could be rotated at a highspeed without requiring particularly strong supports.

In applying this invention to large turbo-generator field magnets, ithas been found uneconomical and therefore undesirable to make the ringsas large, or nearly as large, in diameter as the field magnet, as shownin said application, and for this reason I have adopted the arrangementof connectors herein shown and described.

Figure 1 of the accompanying drawing is a view, partially in endelevation and partially in section, of the rotatable member of atwo-pole dynamo-electric machine that embodies my invention. Fig. 2 is atransverse sectional view on the line IIII of Fig. 1, and Fig. 3 is aface view of connectors employed in a modification of the machine ofFigs. 1 and 2.

Projecting slightly from longitudinal peripheral slots provided at 1 ina laminated field structure 2 that is mounted upon a shaft 3, areconductors 4 of the magnetizing winding for the field magnet, andconnected to the projecting ends of the conductors 4 are a correspondingnumber of conducting bars 5 resembling, in external appearance, thesegments of the commutator of a direct current dynamo-electric machine,in that they comprise a radial portion 6 and a longitudinal portion 7.The conducting bars 5 are supported by, but are insulated from, twoannular rings 8 and 9 carried at opposite ends of a spider 10 that ismounted upon the shaft 3, is provided at its inner end with an integralflinge 11, and is screwthreaded at its outer end for the reception of aclamping ring 13. Clamped between the rings 8 and 9 upon the spider 10,but insulated therefrom and from each other, are a plurality of sheetmetal rings 12 having, for a two-pole field structure, substantiallydiametrically opposite integral lugs 13, the extremities of which arebent into planes at right angles to those of the faces of the rings, andare interleaved with the conducting bars 5 to which they are soldered orotherwise connected in such a manner as to form a complete magnetizingwinding for the field magnet. In assembling the structure, a group or aplurality of the rings 12 are first placed upon the spider 10 adjacentto the ring 9 so that the laterally projecting portions of the lugs 13will extend outwardly away from the field magnet, and then a. group orplurality of spacing rings 14, having no projecting lugs, are placedupon the spider, and finally another group of rings having lugs 13 areplaced upon the spider with the portions that are bent at right anglesto the faces of the rings projecting towards the field magnet. Thisarrangement of the rings permits of the employment of very simple andeffective clamping means therefor, such, for instance, as that shown.The conducting bars 5 are spaced and insulated from each other by meansof insulating wedges 15, whereby a solid and compact cylindricalstructure is provided, metallic bands or rings 16 being shrunk upon theexterior of the cylinder but insulated therefrom, for the purpose ofsecurely holding the structure together.

In applying the invention to a four-pole field structure, the rings 12that serve as end connectors are cut radially at diametrically oppositepoints, as indicated in Fig. 3, and the two semi-circular annular piecesare each provided with two lugs and are insulated from each other andfrom bolts 17 upon which they may be mounted. In assembling thestructure the radial breaks in adjacent rings are staggered in position,as indicated.

I claim as my invention:

In a dynamoelectric machine, a rotatable member com prising a slottedcore, conductors located in and projecting from the core slots, aplurality of annular conductors mounted concentrically with the corehaving ounvardly and laterally projecting lugs, the said annularconductors being arranged in two spaced groups with the lugs of the twogroups projecting toward each other, longitudinally extending conductingbars connected, respectively, to the said lugs and provided withoutwardly projecting radial portions that connect to the ends of thecore conductors.

In testimony whereof, I have hereunto subscribed my name this 27th dayof May 1907.

MILES WALKER.

Witnesses G. D. SEATON, FRANCIS I-IoDGKINsoN.

